I wasn't that impressed by the video either. However, back in 1975, I took a youth group from greater Boston on a bus trip to Washington, D.C.
I believe that we were in either Maryland or Delaware, where the State Police had their emergency lights on a scissor-type lift. We first saw the lights from a decent distance away and couldn't figure out what they were. As we approached, they remained "high" and I couldn't understand how. Then, as we got closer to the scene, I saw the lift for the first time.
Does anyone know if, besides the semi-example from NYC, anyone still uses rising lights?
Steve